The photochemical reactivity of some benzoylthiophenes. IV. The effect of an adjacent methyl group on the excited state reactivity of 3-benzoylthiophene
作者:D. R. Arnold、C. P. Hadjiantoniou
DOI:10.1139/v78-321
日期:1978.8.1
The electronic absorption and phosphorescence emission spectra and the photochemical reactivity of several methyl-3-benzoylthiophenes (2- and 4-methyl-3-benzoylthiophene (1, 2), 2,5-dimethyl-3-benzoylthiophene (3), and 3-(2-methylbenzoyl)thiophene (4)) have been studied. Partial state diagrams have been constructed. The lowest energy absorption in hexane solution in every case is the carbonyl n → π*
几种甲基-3-苯甲酰噻吩(2-和4-甲基-3-苯甲酰噻吩 (1, 2)、2,5-二甲基-3-苯甲酰噻吩 (3) 和 3)的电子吸收和磷光发射光谱以及光化学反应性-(2-甲基苯甲酰基)噻吩 (4)) 已被研究。部分状态图已经构建。在每种情况下,己烷溶液中的最低能量吸收是羰基 n → π* 转变。这些酮的两个最低三线态在能量上接近,事实上,发射三线态(n,π* 或 π,π*)的性质取决于甲基取代的位置和溶剂。研究的光化学反应包括分子内夺氢(通过在全氘甲醇溶液中辐照后相邻甲基中的氘交换显示),乙炔二甲酸二甲酯光环加成到噻吩环上,异丁烯光环加成到羰基上。概括,可能有助于预测光化学反应...